pref("extensions.historics.indexsecure", true);
pref("extensions.historics.indexsize", 1000);
pref("extensions.historics.maxthumbsize", 250);
pref("extensions.historics.indexpagewait", 1000);
pref("extensions.historics.mincachewait", 5);
pref("extensions.historics.saveindexinterval", 60);